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I) HAWKINS, OF SAN FRANCISCO, CALIFORNIA, ASSIGNQR TO ALFRED TEABODY, OFSALEM,

. MASSACHUSETTS.

s r sssva a Gamma A sm ars we COFFEE, AND

Specif cation of Letters Patent No. 3 3,06}, dated August 13 1 861.

To all whom it may concern:

Be it known that I, L. D. HAWKINS, of San Francisco, California, haveinvented a new and Improved Machine for Cleaning Rice, Coffee, and otherGrains and for Smutting Wheat, and that the following is a full andexact description of the same.

My invention consists in the use of a drum or cylinder, covered withstrips of sheep skin with the wool onthem for cleaning rice and othergrains, and with strips of sheet iron -or other. like substance forsmutting wheat, revolving rapidly inside of a hollow cylinder composedof alternate perpendicu: lar stone blocks and'frames of wood or ironcovered with wire cloth, adjusted and used as hereinafter set forth.

The grain to be cleaned is introduced into the machine at the top andpassing down through the space between the drum and the.

outer cylinder it is thrown with great rapidity against the surfaceformed by the stones and the wire cloth, by which the grain is severelyrubbed against the said surface so as to break and peel off the skin orhull which is on it, without pulverizing or break ing the grain itself,and at the same time the substance scraped or rubbed from the tion takenthrough the red lines 00 a: of'

Fig. 2. 7

Similar letters of reference where they ocour in the separate figures,denote like parts of the apparatus, in all the figures.

The base A of the machine, and the upper.

plate B, I propose to make of cast iron, and to unite them by hollowcast iron columns 0, through which rods (1, pass, and these rods mayalso pass through the floor of the building to hold all firmly togetherand to the floor. The chink pieces D, are of wood, and their inner sidesnext the drum are covered with sheep skin to prevent the wearing away ofthe wood, as well as to make a tight joint,

bed and top plate, that they may be set to, or.

from the cylinder, as may be required.

E, E, are stone segments radially arranged on the base and top plate,and F, F, are gauze screens also radially arranged upon said bed and topplate and interposed between the stone segments, so that the stonesegments E, screens or screen frames F, and

chink pieces D, form the outer case of the machine.

G, is a shaft supported in the bridge trees H, I, at the top and bottom,and having upon its upper end a pulley J, around which the belt that isto drive it passes. Upon this shaft is placed a drum or cylinder K, theperimeter of which is covered with sheep skin Z), having the wool uponitor pelts, as they are termed. ering should be large enough to run inclose proximity to the inner edges of the stone segments, screens, andchink pieces.

The stone segments E, at their lower ends rest in shoes L, and by meansof a set screw 0,

these shoes, together with their stone segment may be moved to or fromthe cylinder K, to properly adjust their working surfaces to each other.And a set screw cl, which presses against the stone segments at theirtops, holds them to the cylinder at thatpoint. For the purpose ofremoving or replacing the segments E, the shoe L, has a sliding cleat orledge c which can be removed, and the segment will then slide out; andwhen this ledge is replaced it holds the segment to the shoe.

The screen frames F, are also adjustable; they rest at their base inshoes M, which can be moved toward or from thecylinder, by set screws f,and their tops are adjusted and held up to the cylinder by other setscrews 9, which, like those (Z, above mentioned for adjusting the stonesegments, pass through lugs it, h, said lugs being made removable, sothat the segments, as well as the screen frames may be removed andreplaced when required.

The outer case opposite to the screens F, as shown more distinctly inFig. 1, is open so that the dust and other scourings from the grains maypass out of the case; and thus the alternate scouring or polishingsurfaces of the stone segments, and intervening screens, make oneoperation as it were, of the This cylinder with its covhulling andpolishing, and the separation of the impurities from the cleaned grains,and saves an after separation, as is now practiced.

To prepare this machine, especially for smutting wheat, I propose to useinstead of the sheep skin covering, strips of metal, running up and downthe cylinder, and at an angle sufficient to form a kind of conveyer tohurry the wheat through. But for rice, coffee, and such like grains, theconstruction above set forth is that which I design to use.

In the machine represented in the drawing there are four stones and fourframes, but any number from two of each upward may be used, the numberdepending upon the size of the machine required.

I do not claim the revolving drum covered with sheep skins or othersubstances, nor the stones, nor the frames covered with wire cloth, asmy invention; but

I claim as my invention and desire to secure by Letters Patent,

1. The combination of the stones E, E and wire cloth covered frames F,F, whereby the pulverized skin and dirt from the surface of the grain isthrown out, leaving the stones free to act on the grain, and whereby theaction of a cleaner andpolisher are combined, thus in most cases doingaway with the use of wire polishers as a supplementary process, and 'inall cases materially lightening the work to be done thereby.

2. The adjustment of the wire polisher frames to be moved up toward ordrawn back 35 from the revolving drum simultaneously with the stones.

8. The use of the iron shoes or slides L, M, upon which the stones andframes are placed, in combination with the cast iron bed plate A, andthe screws 0, f, whereby the size of the hollow cylinder composed of thestones and frames may be increased or lessened as desired.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

L. D. HAWKINS

